Steam-boiler



(No Model.)

J. B. BIRDSELL, L. H. BRATT 81; W. P. WETMORE.

STEAM BOILER.

ted Sept. 22, 1885 Paten III/5 illlllllll Hanan,

VII/[Ill N. PETERS. PholvLilhngraphar. Washin ton, 11C.

STATES ATENT Erica.

osnr'n B. einnsnnn, LEVI H. BRATT, AND WILLIAM F. WETMOBE, or

' SOUTH BEND, INDIANA.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 326,833, dated September 22, 1885. Application tiled March 19, 1885. (No model.)

To aZZ whom it may concern."

Be it known that we, J osEPH B. BIRDSELL, LEVI H. BRATT, and WILLIAM F. WETMORE, of South Bend, in the county of St. Joseph and State of Indiana, have invented certain new and useful Improvements in Steam-Boilers; and we do hereby declare that the follow- ,ing is a full, clear,-and exact description thereof, reference being had to the accompanying drawings, and to the letters of referen ce marked thereon, which form part of this specification, in which Figure 1 represents a perspective view of the boiler. Fig. 2 is a vertical transverse section of the same. Fig. 3 is a vertical longitudinal section through the boiler. Fig. 4 is a horizontal section showing the relation of the inner and outer shells and intermediate diaphragm. Fig. 5 represents a modification of one of the tubes.

The invention relates to imprmements in steam-boilers, and has for its main object to provide means whereby a very large amount of heating surface may be exposed to the direct action of the fire, so as to economize both in time and fuel when raising steam.

A further object of the invention is to construct the boiler in such manner that all impurities in the watelgsuch as usually form incrustations, will be deposited in chambers made for their reception, and whence they can be readily removed.

The invention consists in the construction and novel arrangement of parts hereinafter described, and pointed out in the appended claims.

Referring to the accompanying drawings by letter, A designates the outer shell or casing of the boiler, of pyramidal shape, and provided on top with the steamdome and safetyvalve A, of usual construction.

The side edges of the outer shell are made with longitudinal bulges a a, so as to form, with the inner shell hereinafter described, the lateral longitudinal eddy chambers or spaces, B B, the purpose of which is hereinafter explained.

O is theinner shell, of pyramidal form and standing within the outer shell, the flanged edges 0 c of the shells being properly packed and bolted together to make the space between firebox E, which is provided with the grate E and the chimney or fiue e, to carry off the products of combustion, the said flue passing through the outer shell.

The grate E is placed some distance above the level of the eddy-chambers B, for a purpose hereinafter explained.

F is an intermediate continuous diaphragm, preferably of sheet-zinc, surrounding the inner shell, but open abor e and below. The said diaphragm divides the space between the shells into the outer space, f, and the inner space, f, which open into each other at top and bottom only. ff are stay rods or bolts, by means of which the diaphragm is secured in position between the shells.

G G are tubes, which have their upper ends passing through the crown-shell, and rising to the level of the ordinary water-line in the steam-space, and their lower ends below the grate connected by couplingpieces 9 g to short horizontal tubes G, which penetrate the inner shell and enter the spacef. The tubes G form two series, arranged on opposite sides within the firebox, as shown.

H H are manholes in the ends of the outer shell, by means of which access is had to the eddy-chambers B, and H is the ash-pit below the grate.

I is the door of the fire box, covering the outer orifice of a tube connecting the shells and running through the diaphragnis and spaces f and j".

J is a proper steam-pipe, running from the steam-space to connect to the steam-chest of a cylinder in the usual manner.

WVhen a fire is lighted, the w ater in the inner space,f, and tubes G will be nearest thereto, and will be most heated. It will also be heated most near the bottoms of the space and the tubes, and will consequently flow upward therein to the steam-space. This upward current will be returned downward, as shown by the arrows, through the space f, to gain additional heat as it again passes'up through the inner space and pipes.

Now, as the united capacity of the tubes and inner space is considerably greater than the capacity of the outer space, the water will necessarily flow upward through the former at a slower rate than downward through the latter. It will consequently be longer exposed to the heating-surfaces, and will be more quickly returned thereto by the outer space than in the usual construction, so that both time and fuel will be economized.

The water will be coolest at the bottom of the outer space, f, below the fire-gratethat is, in the eddy-chambers Bso that it will be more liable to deposit there dissolved matter;

moreover, the shape of the said chambers causes an eddy in them which partly neutralizes the current of water, and causes suspended matter to be deposited. The chambers are cleaned out through the man-holes H.

The boiler is adapted to be used with either a stationary or portable engine, its shape making it stand steady when used with the latter. ,We are aware that boilers of a pyramidal shape and provided with heating-tubes in the fire-box have been used, and therefore do not claim such broadly.

The couplings 9 may, if desired, be omitted,

and each tube G be made in one piece with a tube, G, and bent to the shape of the coupling at a proper point, as shown in the drawings. The lower end of the tube may be secured to the inner shell by a bush-coupling.

Having described our invention, what We claim is 1. The combination of the shells A 0, diaphragm F, steam-space D, and coupled tubes G and G, with the fire-box E, provided with the grate E, situated at a level above that of the lower ends of the tubes G, substantially as specified.

2. In a pyramidal boiler, the combination, with the inner shell, 0, and diaphragm-F, firebox E, provided with the grate E and steamspace D, of the outer shell, A, provided with the bulges a a, which, when the said outer shell is in place, form the eddychambers'B B, provided at their ends with man-holes H, substantially asand for the purpose specified.

In testimony that weclaim the foregoing as our own we affix our signatures in presence of two witnesses.

JOSEPH B. BIRDSELL. LEVI H. BRATT. WILLIAM F. WETMORE. Witnesses:

CHAS. W. WILEY, CHAS. ALLISON. 

